Bug 197105

Summary:	postfix does not listen on ipv6 interfaces by default
Product:	[Fedora] Fedora	Reporter:	Dennis Gilmore <dennis>
Component:	postfix	Assignee:	Thomas Woerner <twoerner>
Status:	CLOSED RAWHIDE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	dwmw2
Target Milestone:	---	Keywords:	Reopened
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-29 14:36:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	195271

Description Dennis Gilmore 2006-06-28 15:36:18 UTC

Description of problem:
 
postfix has a configuration option to turn on ipv6 support.  with the push for 
supporting ipv6  this  should be enabled by default
from http://www.postfix.org/IPV6_README.html

/etc/postfix/main.cf:
    # You must stop/start Postfix after changing this parameter.
    inet_protocols = ipv4       (DEFAULT: enable IPv4 only)
    inet_protocols = all        (enable IPv4, and IPv6 if supported)
    inet_protocols = ipv4, ipv6 (enable both IPv4 and IPv6)
    inet_protocols = ipv6       (enable IPv6 only)

we currently don't have this in the config  it should be inet_protocols = all  
that way things wont break if the end user disables ipv6 support on their 
system

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Comment 1 Dennis Gilmore 2007-07-10 00:53:56 UTC

ping Please fix this

Comment 2 Thomas Woerner 2007-11-07 12:38:54 UTC

The problem with enabling IPv6 is that postfix will try to deliver emails over
IPv6 before trying over IPv4. In consequence this would be a noticeable slowdown
in mail delivery for most current systems, which are using IPv4 only.

Please enable IPv6 if you need it for your system with "postconf -e
inet_protocols=all" and restart postfix afterwards.

I am sorry, but I have to defer this for now.

Comment 3 David Woodhouse 2007-11-14 06:47:55 UTC

It shouldn't cause a noticeable slowdown at all. RFC3484 essentially says that
unless you have a global IPv6 address, you shouldn't be trying to connect to a
remote server by IPv6. And even if you do, the kernel will return failure
immediately if you have no route.

Please fix this bug.

Comment 4 Thomas Woerner 2007-11-29 14:36:44 UTC

IPv6 enabled in rawhide in package postfix-2.4.6-1.fc9.